Corned Beef Storage and Freezing
Fresh corned beef is usually sold vacuum-packed in brine with a "sell-by" date. It may be refrigerated in the package up to seven days beyond the sell-by date.
If you make your own corned beef, it should be tightly wrapped and stored five to seven days in the refrigerator.
Vacuum-sealed corned beef can be frozen in its original packaging up to one month before cooking.
Hint: There is no need to thaw frozen uncooked corn beef before cooking. It can be popped right into a pot of simmering water.
Cooked corned beef may be refrigerated up to 5 days and frozen up to 2 months.